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diff --git a/sys/netinet/in.c b/sys/netinet/in.c
--- a/sys/netinet/in.c
+++ b/sys/netinet/in.c
@@ -276,7 +276,8 @@
{
u_long i = ntohl(in.s_addr);
- if (IN_MULTICAST(i) || IN_LINKLOCAL(i) || IN_LOOPBACK(i))
+ if (IN_MULTICAST(i) || IN_LINKLOCAL(i) || IN_LOOPBACK(i) ||
+ in_nullhost(in))
return (0);
if (IN_EXPERIMENTAL(i) && !V_ip_allow_net240)
return (0);
diff --git a/sys/netinet/ip_icmp.c b/sys/netinet/ip_icmp.c
--- a/sys/netinet/ip_icmp.c
+++ b/sys/netinet/ip_icmp.c
@@ -783,10 +783,11 @@
if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
(IN_EXPERIMENTAL(ntohl(ip->ip_src.s_addr)) && !V_ip_allow_net240) ||
- (IN_ZERONET(ntohl(ip->ip_src.s_addr)) && !V_ip_allow_net0) ) {
+ (IN_ZERONET(ntohl(ip->ip_src.s_addr)) && !V_ip_allow_net0) ||
+ in_nullhost(ip->ip_src) ) {
m_freem(m); /* Bad return address */
ICMPSTAT_INC(icps_badaddr);
- goto done; /* Ip_output() will check for broadcast */
+ goto done; /* ip_output() will check for broadcast */
}
t = ip->ip_dst;

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